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After days of hiking and canoeing Vágner reels in the biggest arapaima he’s ever seen.

The legendary fish isn’t done yet and nearly knocks Jakub into the lagoon.

Once the white sturgeons get the bait, they can play with it for 15 minutes to half an hour.

Back at the camp, a new battle is brewing: the big bear is back!

Jakub is running out of steam. His only hope is that the fish is just as tired.

This expedition brings the Czech Republic native to a destination more foreign than any other.

Kirk’s dad joins him and Vágner and the guys have a small fishing competition.

About 90 miles from the Trinity River, Lake Sam Rayburn might hold better luck for Jakub.

Join Bud and Carrie DeYoung in Nat Geo Wild's new series Backyard Zoo.

Pat heads out with his thermal imaging camera to find out what goes bump in the night.

Pat heads to Mongolia to test his wrestling skills and find out more about the so-called Death Worm.

An eyewitness in Mongolia talks about her terrifying encounter with the Death Worm.

Pat finds a snake that might have been mistakenly identified as a death worm.

One of the world’s most legendary monsters is a sea serpent reported off the coast of British Columbia.

Is the sea serpent really an animal thought to be extinct? Or simply an unusually large oarfish?